Testing using Jest

01_helloWorld/helloWorld.js

@@ -1,5 +1,5 @@
 const helloWorld = function() {
-  return ''
+  return 'Hello, World!'
 };
 
 module.exports = helloWorld;

02_repeatString/repeatString.js

@@ -1,5 +1,13 @@
-const repeatString = function() {
+const repeatString = function(string, num) {
+    let str = "";
 
+    if (num < 0) return "ERROR";
+    
+    for (let i = 0; i < num; i++) {
+        str += string;
+    }
+
+    return str;
 };
 
 // Do not edit below this line

02_repeatString/repeatString.spec.js

@@ -4,19 +4,19 @@ describe('repeatString', () => {
   test('repeats the string', () => {
     expect(repeatString('hey', 3)).toEqual('heyheyhey');
   });
-  test.skip('repeats the string many times', () => {
+  test('repeats the string many times', () => {
     expect(repeatString('hey', 10)).toEqual('heyheyheyheyheyheyheyheyheyhey');
   });
-  test.skip('repeats the string 1 times', () => {
+  test('repeats the string 1 times', () => {
     expect(repeatString('hey', 1)).toEqual('hey');
   });
-  test.skip('repeats the string 0 times', () => {
+  test('repeats the string 0 times', () => {
     expect(repeatString('hey', 0)).toEqual('');
   });
-  test.skip('returns ERROR with negative numbers', () => {
+  test('returns ERROR with negative numbers', () => {
     expect(repeatString('hey', -1)).toEqual('ERROR');
   });
-  test.skip('repeats the string a random amount of times', function () {
+  test('repeats the string a random amount of times', function () {
     /*The number is generated by using Math.random to get a value from between
     0 to 1, when this is multiplied by 1000 and rounded down with Math.floor it 
     equals a number between 0 to 999 (this number will change everytime you run
@@ -31,7 +31,7 @@ describe('repeatString', () => {
     was randomly generated. */
     expect(repeatString('hey', number).match(/((hey))/g).length).toEqual(number);
   });
-  test.skip('works with blank strings', () => {
+  test('works with blank strings', () => {
     expect(repeatString('', 10)).toEqual('');
   });
 });

03_reverseString/reverseString.js

@@ -1,5 +1,5 @@
-const reverseString = function() {
-
+const reverseString = function(string) {
+    return string.split('').reverse().join('');
 };
 
 // Do not edit below this line

03_reverseString/reverseString.spec.js

@@ -5,14 +5,14 @@ describe('reverseString', () => {
     expect(reverseString('hello')).toEqual('olleh');
   });
 
-  test.skip('reverses multiple words', () => {
+  test('reverses multiple words', () => {
     expect(reverseString('hello there')).toEqual('ereht olleh')
   })
 
-  test.skip('works with numbers and punctuation', () => {
+  test('works with numbers and punctuation', () => {
     expect(reverseString('123! abc!')).toEqual('!cba !321')
   })
-  test.skip('works with blank strings', () => {
+  test('works with blank strings', () => {
     expect(reverseString('')).toEqual('')
   })
 });

04_removeFromArray/removeFromArray.js

@@ -1,5 +1,13 @@
-const removeFromArray = function() {
+const removeFromArray = function(array, ...args) {
+    const newArray = [];
     
+    array.forEach(element => {
+        if (!args.includes(element)) {
+            newArray.push(element);
+        }
+    });
+
+    return newArray;
 };
 
 // Do not edit below this line

04_removeFromArray/removeFromArray.spec.js

@@ -4,22 +4,22 @@ describe('removeFromArray', () => {
   test('removes a single value', () => {
     expect(removeFromArray([1, 2, 3, 4], 3)).toEqual([1, 2, 4]);
   });
-  test.skip('removes multiple values', () => {
+  test('removes multiple values', () => {
     expect(removeFromArray([1, 2, 3, 4], 3, 2)).toEqual([1, 4]);
   });
-  test.skip('ignores non present values', () => {
+  test('ignores non present values', () => {
     expect(removeFromArray([1, 2, 3, 4], 7, "tacos")).toEqual([1, 2, 3, 4]);
   });
-  test.skip('ignores non present values, but still works', () => {
+  test('ignores non present values, but still works', () => {
     expect(removeFromArray([1, 2, 3, 4], 7, 2)).toEqual([1, 3, 4]);
   });
-  test.skip('can remove all values', () => {
+  test('can remove all values', () => {
     expect(removeFromArray([1, 2, 3, 4], 1, 2, 3, 4)).toEqual([]);
   });
-  test.skip('works with strings', () => {
+  test('works with strings', () => {
     expect(removeFromArray(["hey", 2, 3, "ho"], "hey", 3)).toEqual([2, "ho"]);
   });
-  test.skip('only removes same type', () => {
+  test('only removes same type', () => {
     expect(removeFromArray([1, 2, 3], "1", 3)).toEqual([1, 2]);
   });
 });

05_sumAll/sumAll.js

@@ -1,5 +1,19 @@
-const sumAll = function() {
+const sumAll = function(num1, num2) {
+    let final = 0;
 
+    if (num1 < 0 || num2 < 0 || typeof num1 != 'number' || typeof num2 != 'number') {
+        return "ERROR";
+    } else if (num2 > num1) {
+        for (let i = num1; i <= num2; i++) {
+            final += i;
+        }
+    } else if (num1 > num2) {
+        for (let i = num2; i <= num1; i++) {
+            final += i;
+        }
+    } 
+
+    return final;
 };
 
 // Do not edit below this line

05_sumAll/sumAll.spec.js

@@ -4,19 +4,19 @@ describe('sumAll', () => {
   test('sums numbers within the range', () => {
     expect(sumAll(1, 4)).toEqual(10);
   });
-  test.skip('works with large numbers', () => {
+  test('works with large numbers', () => {
     expect(sumAll(1, 4000)).toEqual(8002000);
   });
-  test.skip('works with larger number first', () => {
+  test('works with larger number first', () => {
     expect(sumAll(123, 1)).toEqual(7626);
   });
-  test.skip('returns ERROR with negative numbers', () => {
+  test('returns ERROR with negative numbers', () => {
     expect(sumAll(-10, 4)).toEqual('ERROR');
   });
-  test.skip('returns ERROR with non-number parameters', () => {
+  test('returns ERROR with non-number parameters', () => {
     expect(sumAll(10, "90")).toEqual('ERROR');
   });
-  test.skip('returns ERROR with non-number parameters', () => {
+  test('returns ERROR with non-number parameters', () => {
     expect(sumAll(10, [90, 1])).toEqual('ERROR');
   });
 });

06_leapYears/leapYears.js

@@ -1,5 +1,11 @@
-const leapYears = function() {
-
+const leapYears = function(year) {
+    if (year % 400 == 0) {
+        return true
+    } else if (year % 4 == 0 && year % 100 != 0) {
+        return true
+    } else {
+        return false
+    }
 };
 
 // Do not edit below this line

06_leapYears/leapYears.spec.js

@@ -4,19 +4,19 @@ describe('leapYears', () => {
   test('works with non century years', () => {
     expect(leapYears(1996)).toBe(true);
   });
-  test.skip('works with non century years', () => {
+  test('works with non century years', () => {
     expect(leapYears(1997)).toBe(false);
   });
-  test.skip('works with ridiculously futuristic non century years', () => {
+  test('works with ridiculously futuristic non century years', () => {
     expect(leapYears(34992)).toBe(true);
   });
-  test.skip('works with century years', () => {
+  test('works with century years', () => {
     expect(leapYears(1900)).toBe(false);
   });
-  test.skip('works with century years', () => {
+  test('works with century years', () => {
     expect(leapYears(1600)).toBe(true);
   });
-  test.skip('works with century years', () => {
+  test('works with century years', () => {
     expect(leapYears(700)).toBe(false);
   });
 });

07_tempConversion/tempConversion.js

@@ -1,7 +1,9 @@
-const convertToCelsius = function() {
+const convertToCelsius = function(num) {
+  return Math.round(((num - 32) * (5 / 9)) * 10) / 10;
 };
 
-const convertToFahrenheit = function() {
+const convertToFahrenheit = function(num) {
+  return Math.round((num * (9 / 5) + 32) * 10) / 10;
 };
 
 // Do not edit below this line

07_tempConversion/tempConversion.spec.js

@@ -4,22 +4,22 @@ describe('convertToCelsius', () => {
   test('works', () => {
     expect(convertToCelsius(32)).toEqual(0);
   });
-  test.skip('rounds to 1 decimal', () => {
+  test('rounds to 1 decimal', () => {
     expect(convertToCelsius(100)).toEqual(37.8);
   });
-  test.skip('works with negatives', () => {
+  test('works with negatives', () => {
     expect(convertToCelsius(-100)).toEqual(-73.3);
   });
 });
 
 describe('convertToFahrenheit', () => {
-  test.skip('works', () => {
+  test('works', () => {
     expect(convertToFahrenheit(0)).toEqual(32);
   });
-  test.skip('rounds to 1 decimal', () => {
+  test('rounds to 1 decimal', () => {
     expect(convertToFahrenheit(73.2)).toEqual(163.8);
   });
-  test.skip('works with negatives', () => {
+  test('works with negatives', () => {
     expect(convertToFahrenheit(-10)).toEqual(14);
   });
 });

08_calculator/calculator.js

@@ -1,25 +1,66 @@
-const add = function() {
-	
+const add = function(num1, num2) {
+  return num1 + num2
 };
 
-const subtract = function() {
-	
+const subtract = function(num1, num2) {
+	return num1 - num2
 };
 
-const sum = function() {
+const sum = function(array) {
+  let sums = 0;
 
+	if (array.length == 0) {
+    return sums
+  } else if (array.length == 1) {
+    return array[0]
+  } else {
+    array.forEach(element => {
+      sums += element
+    });
+
+    return sums
+  }
 };
 
-const multiply = function() {
+const multiply = function(array) {
+  let value = 1;
   
+  if (array.length == 0) {
+    return 0
+  } else if (array.length == 1) {
+    return array[0]
+  } else {
+    array.forEach(element => {
+      value = value * element
+    });
+
+    return value
+  }
 };
 
-const power = function() {
+const power = function(num1, num2) {
+  let value = 1;
 
+  if (num2 == 0) { return 1 }
+  if (num2 == 1) { return num1 }
+
+	for (let i = 0; i < num2; i++) {
+    value = value * num1
+  }
+
+  return value
 };
 
-const factorial = function() {
+const factorial = function(num) {
+	let value = 1;
 
+  if (num == 1) { return 1 }
+
+  for (let i = 1; i <= num; i ++) {
+    value = value * i
+  }
+
+  return value
 };
 
 // Do not edit below this line

08_calculator/calculator.spec.js

@@ -5,73 +5,73 @@ describe('add', () => {
 		expect(calculator.add(0,0)).toBe(0);
 	});
 
-	test.skip('adds 2 and 2', () => {
+	test('adds 2 and 2', () => {
 		expect(calculator.add(2,2)).toBe(4);
 	});
 
-	test.skip('adds positive numbers', () => {
+	test('adds positive numbers', () => {
 		expect(calculator.add(2,6)).toBe(8);
 	});
 });
 
 describe('subtract', () => {
-	test.skip('subtracts numbers', () => {
+	test('subtracts numbers', () => {
 		expect(calculator.subtract(10,4)).toBe(6);
 	});
 });
 
 describe('sum', () => {
-	test.skip('computes the sum of an empty array', () => {
+	test('computes the sum of an empty array', () => {
 		expect(calculator.sum([])).toBe(0);
 	});
 
-	test.skip('computes the sum of an array of one number', () => {
+	test('computes the sum of an array of one number', () => {
 		expect(calculator.sum([7])).toBe(7);
 	});
 
-	test.skip('computes the sum of an array of two numbers', () => {
+	test('computes the sum of an array of two numbers', () => {
 		expect(calculator.sum([7,11])).toBe(18);
 	});
 
-	test.skip('computes the sum of an array of many numbers', () => {
+	test('computes the sum of an array of many numbers', () => {
 		expect(calculator.sum([1,3,5,7,9])).toBe(25);
 	});
 });
 
 describe('multiply', () => {
-	test.skip('multiplies two numbers', () => {
+	test('multiplies two numbers', () => {
 		expect(calculator.multiply([2,4])).toBe(8);
 	});
 
-	test.skip('multiplies several numbers', () => {
+	test('multiplies several numbers', () => {
 		expect(calculator.multiply([2,4,6,8,10,12,14])).toBe(645120);
 	});
 });
 
 describe('power', () => {
-	test.skip('raises one number to the power of another number', () => {
+	test('raises one number to the power of another number', () => {
 		expect(calculator.power(4,3)).toBe(64); // 4 to third power is 64
 	});
 });
 
 describe('factorial', () => {
-	test.skip('computes the factorial of 0', () => {
+	test('computes the factorial of 0', () => {
 		expect(calculator.factorial(0)).toBe(1); // 0! = 1
 	});
 
-	test.skip('computes the factorial of 1', () => {
+	test('computes the factorial of 1', () => {
 		expect(calculator.factorial(1)).toBe(1);
 	});
 
-	test.skip('computes the factorial of 2', () => {
+	test('computes the factorial of 2', () => {
 		expect(calculator.factorial(2)).toBe(2);
 	});
 
-	test.skip('computes the factorial of 5', () => {
+	test('computes the factorial of 5', () => {
 		expect(calculator.factorial(5)).toBe(120);
 	});
 
-	test.skip('computes the factorial of 10', () => {
+	test('computes the factorial of 10', () => {
 		expect(calculator.factorial(10)).toBe(3628800);
 	});
 });

09_palindromes/palindromes.js

@@ -1,5 +1,8 @@
-const palindromes = function () {
+const palindromes = function (string) {
+    let str = string.toLowerCase().replace(/[^a-z]/g, "");
+    let reverse = str.split("").reverse().join("");
 
+    return str === reverse;
 };
 
 // Do not edit below this line

09_palindromes/palindromes.spec.js

@@ -4,22 +4,22 @@ describe('palindromes', () => {
   test('works with single words', () => {
     expect(palindromes('racecar')).toBe(true);
   });
-  test.skip('works with punctuation ', () => {
+  test('works with punctuation ', () => {
     expect(palindromes('racecar!')).toBe(true);
   });
-  test.skip('works with upper-case letters ', () => {
+  test('works with upper-case letters ', () => {
     expect(palindromes('Racecar!')).toBe(true);
   });
-  test.skip('works with multiple words', () => {
+  test('works with multiple words', () => {
     expect(palindromes('A car, a man, a maraca.')).toBe(true);
   });
-  test.skip('works with multiple words', () => {
+  test('works with multiple words', () => {
     expect(palindromes('Animal loots foliated detail of stool lamina.')).toBe(true);
   });
-  test.skip('doesn\'t just always return true', () => {
+  test('doesn\'t just always return true', () => {
     expect(palindromes('ZZZZ car, a man, a maracaz.')).toBe(false);
   });
-  test.skip('works with numbers in a string', () => {
+  test('works with numbers in a string', () => {
     expect(palindromes('rac3e3car')).toBe(true);
   });
 });

10_fibonacci/fibonacci.js

@@ -1,5 +1,21 @@
-const fibonacci = function() {
+const fibonacci = function(num) {
+    if (num < 0) { return "OOPS" }
+    if (num == 0) { return 0 }
+    if (num == 1) { return 1 }
 
+    if (!isNaN(num)) {
+        let num1 = 0;
+        let num2 = 1;
+        let value = 0;
+
+        for (let i = 1; i < num; i++) {
+            value = num1 + num2;
+            num1 = num2;
+            num2 = value;
+    }
+
+    return value
+    }
 };
 
 // Do not edit below this line

10_fibonacci/fibonacci.spec.js

@@ -4,28 +4,28 @@ describe('fibonacci', () => {
   test('4th fibonacci number is 3', () => {
     expect(fibonacci(4)).toBe(3);
   });
-  test.skip('6th fibonacci number is 8', () => {
+  test('6th fibonacci number is 8', () => {
     expect(fibonacci(6)).toBe(8);
   });
-  test.skip('10th fibonacci number is 55', () => {
+  test('10th fibonacci number is 55', () => {
     expect(fibonacci(10)).toBe(55);
   });
-  test.skip('15th fibonacci number is 610', () => {
+  test('15th fibonacci number is 610', () => {
     expect(fibonacci(15)).toBe(610);
   });
-  test.skip('25th fibonacci number is 75025', () => {
+  test('25th fibonacci number is 75025', () => {
     expect(fibonacci(25)).toBe(75025);
   });
-  test.skip('doesn\'t accept negatives', () => {
+  test('doesn\'t accept negatives', () => {
     expect(fibonacci(-25)).toBe("OOPS");
   });
-  test.skip('DOES accept strings', () => {
+  test('DOES accept strings', () => {
     expect(fibonacci("1")).toBe(1);
   });
-  test.skip('DOES accept strings', () => {
+  test('DOES accept strings', () => {
     expect(fibonacci("2")).toBe(1);
   });
-  test.skip('DOES accept strings', () => {
+  test('DOES accept strings', () => {
     expect(fibonacci("8")).toBe(21);
   });
 });

11_getTheTitles/getTheTitles.js

@@ -1,5 +1,5 @@
-const getTheTitles = function() {
-
+const getTheTitles = function(books) {
+    return books.map((book) => book.title);
 };
 
 // Do not edit below this line

12_findTheOldest/findTheOldest.js

@@ -1,5 +1,19 @@
-const findTheOldest = function() {
+const findTheOldest = function(array) {
+    return array.reduce((oldest, currentPerson) => {
+        const oldestAge = getAge(oldest.yearOfBirth, oldest.yearOfDeath);
+        const currentAge = getAge(
+            currentPerson.yearOfBirth,
+            currentPerson.yearOfDeath
+        );
+        return oldestAge < currentAge ? currentPerson : oldest;
+    });
+};
 
+const getAge = function(birth, death) {
+    if (!death) {
+        death = new Date().getFullYear();
+    }
+    return death - birth;
 };
 
 // Do not edit below this line

12_findTheOldest/findTheOldest.spec.js

@@ -21,7 +21,7 @@ describe('findTheOldest', () => {
     ]
     expect(findTheOldest(people).name).toBe('Ray');
   });
-  test.skip('finds the oldest person if someone is still living', () => {
+  test('finds the oldest person if someone is still living', () => {
     const people = [
       {
         name: "Carly",
@@ -40,7 +40,7 @@ describe('findTheOldest', () => {
     ]
     expect(findTheOldest(people).name).toBe('Ray');
   });
-  test.skip('finds the oldest person if the OLDEST is still living', () => {
+  test('finds the oldest person if the OLDEST is still living', () => {
     const people = [
       {
         name: "Carly",

package.json

@@ -14,11 +14,11 @@
   },
   "homepage": "https://github.com/TheOdinProject/javascript-exercises#readme",
   "devDependencies": {
-    "jest": "^26.6.3",
-    "jest-cli": "^26.6.3",
     "eslint": "^7.26.0",
     "eslint-config-airbnb-base": "^14.2.1",
-    "eslint-plugin-import": "^2.22.1"
+    "eslint-plugin-import": "^2.22.1",
+    "jest": "^26.6.3",
+    "jest-cli": "^26.6.3"
   },
   "scripts": {
     "test": "jest"